Please help. If you can record video & audio through the speakers, why do you need the mic as well?

I have literally been trying to get through a 16 minute tutorial for hours now, and do I even need the external mic? I'm concerned because at one point, I wanted to hear what the mic was doing (configuring it) and it was so garbled that it made me wonder if the lecture I want to record will be also garbled if I use the mic. Will just the speakers pick up the audio? Thanks, it's very confusing...I am not a teckie...far far from it. Many thanks!

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Please help. If you can record video & audio through the speakers, why do you need the mic as well?

I have literally been trying to get through a 16 minute tutorial for hours now, and do I even need the external mic? I'm concerned because at one point, I wanted to hear what the mic was doing (configuring it) and it was so garbled that it made me wonder if the lecture I want to record will be also garbled if I use the mic. Will just the speakers pick up the audio? Thanks, it's very confusing...I am not a teckie...far far from it. Many thanks!